People swimming in Cenote Zaci, carboniferous limestone swallow hole pool, Valladolid, Yucatan, Mexico, North America

Carboniferous limestone karst scenery, near Benimaurell, Vall de Laguar, Marina Alta, Alicante province, Spain, Europe

Fossil Colonial Coral, Carboniferous Limestone, The Burren, County Clare, Ireland,

Fossil ferns found in Radstock Colliery, Mariopteris carboniferous coal measures, Somerset, England, United Kingdom, Europe

Prehistoric, Permo-Carboniferous Landscape